The photochemistry of 5-methylphenazinium (MP') salts in aqueous solutions for pH 2-7 has been studied by using fluorescence, optical flash photolysis, and electron paramagnetic resonance (EPR) techniques. A complete mechanism has been proposed which accounts for all of the known observations on this reaction. The fluorescence yield is-1% and independent of pH for pH> 4 but drops sharply for pH< 3 presumably because of the ...
